Microsoft Entra ID
SecuritySecurity Updates Pks
In brief
The deadline changed to April 7, 2027. Administrators must upgrade to version 2.5.79.0 or later and configure application-based authentication; synchronization stops after the deadline if requirements are unmet.
What Entra admins need to know
Upgrade and configure application-based authentication before the deadline to avoid synchronization outages.
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Documentation change
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Consider moving to Microsoft Entra Cloud Sync
@@ -36,9 +36,9 @@ To upgrade to the latest version. > [Install Microsoft Entra Connect](https://www.microsoft.com/download/details.aspx?id=47594) >[!IMPORTANT]->**Mandatory Upgrade Required**: All synchronization services in Microsoft Entra Connect Sync will stop working on **September 30, 2026** if you're not on at least version 2.5.79.0. In May 2025, we released this version with a back-end service change that hardens our services. Upgrade before this deadline to avoid any service disruption.+>Mandatory upgrade required: Upgrade Microsoft Entra Connect Sync to version 2.5.79.0 or later and configure application-based authentication by April 7, 2027. Legacy authentication is being retired, and synchronization services will stop working after this date if these requirements aren't met. >->If you're unable to upgrade before the deadline, all synchronization services will fail until you upgrade to the latest version. Make sure you meet the minimum requirements including .NET Framework 4.7.2 and TLS 1.2.+>If synchronization stops, upgrade to the latest version and configure application-based authentication to restore service. The Microsoft Entra Connect Sync .msi installation file is exclusively available on [Microsoft Entra Admin Center](https://entra.microsoft.com/#view/Microsoft_AAD_Connect_Provisioning/AADConnectMenuBlade/%7E/GetStarted). Make sure you meet the minimum requirements including .NET Framework 4.7.2 and TLS 1.2. ## Consider moving to Microsoft Entra Cloud Sync